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                    配环境、跑测试
            
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                    step1：仅一个 return 的 main 函数
            
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                    从零开始的 lexer、parser 以及汇编生成
            
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                    step2：一元操作
            
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                    实验指导
            
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                    规范
            
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                    step3：加减乘除模
            
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                    实验指导
            
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                    step4：比较和逻辑表达式
            
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                    实验指导
            
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                    规范
            
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                    step5：局部变量和赋值
            
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                    实验指导
            
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                    其他
            
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                    栈帧
            
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                    规范
            
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                    step6：if 语句和条件表达式
            
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                    实验指导
            
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        <li class="header">块语句和作用域和更多语句</li>
        
        
    
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                    step7：作用域和块语句
            
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                    step8：循环语句
            
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                    实验指导
            
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                    规范
            
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                    step9：函数
            
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                    实验指导
            
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                    其他
            
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                    函数调用
            
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                    step10：全局变量
            
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                    摘要
            
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                    词法语法分析
            
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                    任务
            
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                    代码生成
            
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                    任务
            
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                    小结
            
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                    step11：指针
            
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                    摘要
            
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                    任务
            
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                    小结
            
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                    step12：数组
            
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<p>&#x5982;&#x679C;&#x4F60;&#x662F;&#x624B;&#x5199;&#x5206;&#x6790;&#xFF0C;TODO</p>
<h2 id="&#x540D;&#x79F0;&#x89E3;&#x6790;">&#x540D;&#x79F0;&#x89E3;&#x6790;</h2>
<p>step7 &#x6211;&#x4EEC;&#x9700;&#x8981;&#x7ED9;&#x81EA;&#x5DF1;&#x7684;&#x7F16;&#x8BD1;&#x5668;&#x65B0;&#x589E;&#x4E00;&#x4E2A;&#x9636;&#x6BB5;&#xFF1A;&#x540D;&#x79F0;&#x89E3;&#x6790;&#xFF0C;&#x5B83;&#x4F4D;&#x4E8E;&#x8BED;&#x6CD5;&#x5206;&#x6790;&#x548C; IR &#x751F;&#x6210;&#x4E4B;&#x95F4;&#x3002;</p>
<blockquote>
<p>&#x8FD9;&#x4E2A;&#x8BCD;&#x5E7F;&#x4E49;&#x4E0A;&#x7684;&#x542B;&#x4E49;&#x5C31;&#x662F;&#xFF1A;&#x628A;&#x540D;&#x79F0;&#x5173;&#x8054;&#x5230;&#x5BF9;&#x5E94;&#x7684;&#x5B9E;&#x4F53;&#x3002;&#x4F8B;&#x5982;&#x7F51;&#x7EDC;&#x539F;&#x7406;&#x4E2D;&#x7684; DNS &#x4E5F;&#x662F;&#x540D;&#x79F0;&#x89E3;&#x6790;&#x3002;</p>
<p>&#x5E76;&#x4E14;&#xFF0C;&#x6211;&#x4EEC;&#x6240;&#x8C13; &#x201C;&#x9636;&#x6BB5;&#x201D; &#x4E5F;&#x53EA;&#x662F;&#x903B;&#x8F91;&#x4E0A;&#x7684;&#x3002;&#x5C31; MiniDecaf &#x7684;&#x5B9E;&#x73B0;&#x800C;&#x8A00;&#xFF0C;&#x540D;&#x79F0;&#x89E3;&#x6790;&#x7684;&#x4EE3;&#x7801;&#x4E5F;&#x53EF;&#x4EE5;&#x5D4C;&#x5165; IR &#x751F;&#x6210;&#x91CC;&#x3002;</p>
</blockquote>
<p>&#x540D;&#x79F0;&#x89E3;&#x6790;&#x7684;&#x9636;&#x6BB5;&#x4EFB;&#x52A1;&#x5C31;&#x662F;&#x628A; <strong>AST &#x4E2D;&#x51FA;&#x73B0;&#x7684;&#x6BCF;&#x4E2A;&#x53D8;&#x91CF;&#x540D;&#x5173;&#x8054;&#x5230;&#x5BF9;&#x5E94;&#x7684;&#x53D8;&#x91CF;</strong>&#xFF0C;&#x5B83;&#x9700;&#x8981;&#x904D;&#x5386; AST&#xFF0C;&#x6240;&#x4EE5;&#x5B9E;&#x73B0;&#x4E3A; AST &#x4E0A;&#x7684;&#x4E00;&#x4E2A; Visitor</p>
<ul>
<li><em>&#x5B83;&#x7684;&#x8F93;&#x5165;</em> &#x662F; parser &#x7ED9;&#x7684; AST</li>
<li><em>&#x5B83;&#x7684;&#x8F93;&#x51FA;</em> &#x662F;&#x4E0A;&#x9762;&#x90A3;&#x68F5; AST&#xFF0C;&#x4F46; AST &#x4E2D;&#x6240;&#x6709;&#x6D89;&#x53CA;&#x53D8;&#x91CF;&#x540D;&#x7684;&#x7ED3;&#x70B9;&#x90FD;&#x589E;&#x52A0;&#x4E00;&#x4E2A;&#x5C5E;&#x6027;&#xFF0C;&#x8868;&#x793A;&#x6B64;&#x5904;&#x7684;&#x53D8;&#x91CF;&#x540D;&#x5230;&#x5E95;&#x6807;&#x8BC6;&#x54EA;&#x4E2A;&#x53D8;&#x91CF;<blockquote>
<p>&#x8FD9;&#x6837;&#x7684;&#x7ED3;&#x70B9;&#x6709;&#xFF1A;<code>primary</code>&#x3001;<code>assignment</code> &#x548C; <code>declaration</code>&#x3002;</p>
<p>&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x8FD9;&#x6837;&#x7684;&#x5C5E;&#x6027;&#x53EF;&#x4EE5;&#x5B9E;&#x73B0;&#x4E3A;&#x6307;&#x5411; <a href="../lab5/stackframe.html#&#x53D8;&#x91CF;&#x58F0;&#x660E;">&#x53D8;&#x91CF;&#x6570;&#x636E;&#x7ED3;&#x6784;</a> &#x7684;&#x4E00;&#x4E2A;&#x6307;&#x9488;&#x3002;
&#x4E5F;&#x53EF;&#x4EE5;&#x5B9E;&#x73B0;&#x4E3A;&#x4E00;&#x4E2A;&#x4ECE; AST &#x7ED3;&#x70B9;&#x5230;&#x53D8;&#x91CF;&#x7684;&#x6620;&#x5C04;&#x3002;</p>
</blockquote>
</li>
</ul>
<p>&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#xFF1A;</p>
<blockquote>
<p>&#x8003;&#x8651;&#x6211;&#x4EEC;&#x6709;&#x4E00;&#x6BB5;&#x4EE3;&#x7801;&#xFF1A;</p>
<pre><code>{
    int a=0;
    a=
        a+1;
    {
        int a=
                a+1;
        return a;
    }
    return a;
    {
        int b=12;
        return a
                +b;
    }
}
</code></pre><p>&#x663E;&#x7136;&#x5176;&#x4E2D;&#x6709;&#x4E09;&#x4E2A;&#x53D8;&#x91CF;&#xFF0C;&#x4E24;&#x4E2A;&#x7684;&#x540D;&#x5B57;&#x662F; <code>a</code> &#x4E00;&#x4E2A;&#x7684;&#x662F; <code>b</code>&#x3002;&#x4E0D;&#x59A8;&#x628A;&#x8FD9;&#x4E09;&#x4E2A;&#x53D8;&#x91CF;&#x8BB0;&#x4E3A; <code>a0</code>, <code>a1</code>, <code>b0</code>&#x3002;
&#x540D;&#x79F0;&#x89E3;&#x6790;&#x5E94;&#x5F53;&#x53D1;&#x73B0;&#x8FD9;&#x70B9;&#xFF0C;&#x5E76;&#x4E14;&#x8FD8;&#x8981;&#x628A;&#x6BCF;&#x4E2A;&#x53D8;&#x91CF;&#x540D;&#x5173;&#x8054;&#x5230;&#x53D8;&#x91CF;&#xFF0C;&#x6240;&#x4EE5;&#x5B83;&#x63D0;&#x4F9B;&#x7684;&#x4FE1;&#x606F;&#x7C7B;&#x4F3C;&#xFF1A;</p>
<pre><code>{
    int a=0;            // a0
    a=                  // a0
        a+1;            // a0
    {
        int a=          // a1
                a+1;    // a0
        return a;       // a1
    }
    return a;           // a0
    {
        int b=12;       // b0
        return a        // a0
                +b;     // b0
    }
}
</code></pre><p>&#x5982;&#x679C;&#x6309;&#x7167;&#x5B9A;&#x4E49;&#x628A;&#x8FD9;&#x4E2A;&#x7ED3;&#x679C;&#x753B;&#x5728;&#x8BED;&#x6CD5;&#x6811;&#x4E0A;&#xFF0C;&#x90A3;&#x4E48;&#x5927;&#x81F4;&#x5982;&#xFF08;&#x7701;&#x7565;&#x4E86;&#x4E00;&#x4E9B;&#x4E0D;&#x91CD;&#x8981;&#x7684;&#x4E2D;&#x95F4;&#x7ED3;&#x70B9;&#xFF09;
<img src="pics/namer.svg" alt=""></p>
</blockquote>
<p>&#x7528;&#x4E8E;&#x50A8;&#x5B58;&#x53D8;&#x91CF;&#x4FE1;&#x606F;&#x7684; <strong>&#x7B26;&#x53F7;&#x8868;</strong> &#x7684;&#x7ED3;&#x6784;&#x4E5F;&#x9700;&#x8981;&#x6539;&#x8FDB;&#xFF0C;&#x4EE5;&#x652F;&#x6301;&#x4F5C;&#x7528;&#x57DF;&#x3002;&#x5177;&#x4F53;&#x7684;&#xFF0C;&#x5B83;&#x9700;&#x8981;&#x652F;&#x6301;</p>
<ol>
<li>&#x7B26;&#x53F7;&#x8868;&#x4E2D;&#xFF0C;&#x533A;&#x5206;&#x4E0D;&#x540C;&#x4F5C;&#x7528;&#x57DF;&#x7684;&#x53D8;&#x91CF;&#xFF1A;&#x652F;&#x6301;&#x58F0;&#x660E;&#x8986;&#x76D6;&#xFF08;shadowing)&#x3001;&#x68C0;&#x67E5;&#x91CD;&#x590D;&#x58F0;&#x660E;</li>
<li>&#x79BB;&#x5F00;&#x67D0;&#x4F5C;&#x7528;&#x57DF;&#x65F6;&#xFF0C;&#x8981;&#x628A;&#x5176;&#x4E2D;&#x7684;&#x53D8;&#x91CF;&#x4ECE;&#x7B26;&#x53F7;&#x8868;&#x4E2D;&#x5220;&#x9664;</li>
</ol>
<p>&#x4E3A;&#x6B64;&#xFF0C;&#x6211;&#x4EEC;&#x628A;&#x7B26;&#x53F7;&#x8868;&#x6539;&#x9020;&#x4E3A;&#x4E00;&#x4E2A;&#x6808;&#x3002;</p>
<ol>
<li>(&#x5BF9;&#x5E94;&#x4E0A;&#x9762; 1.&#xFF09;&#x6808;&#x4E2D;&#x6BCF;&#x4E2A;&#x5143;&#x7D20;&#x90FD;&#x5BF9;&#x5E94;&#x4E00;&#x4E2A;&#x5F00;&#x4F5C;&#x7528;&#x57DF;&#xFF0C;&#x662F;&#x4E00;&#x4E2A;&#x5217;&#x8868;&#xFF0C;&#x5305;&#x542B;&#x8BE5;&#x4F5C;&#x7528;&#x57DF;&#x4E2D;&#x81F3;&#x4ECA;&#x58F0;&#x660E;&#x8FC7;&#x7684;&#x6240;&#x6709;&#x53D8;&#x91CF;&#x3002;<blockquote>
<p>&#x7A0B;&#x5E8F;&#x4E2D;&#x4E0D;&#x540C;&#x4F4D;&#x7F6E;&#x7684;&#x7B26;&#x53F7;&#x8868;&#x662F;&#x4E0D;&#x540C;&#x7684;&#xFF1B;&#x67D0;&#x4F4D;&#x7F6E;&#x7684; <strong>&#x5F00;&#x4F5C;&#x7528;&#x57DF;&#xFF08;open scope&#xFF09;</strong> &#x6307;&#x7684;&#x662F;&#x5305;&#x542B;&#x8BE5;&#x4F4D;&#x7F6E;&#x7684;&#x6240;&#x6709;&#x4F5C;&#x7528;&#x57DF;&#x3002;
&#x4F8B;&#x5982;&#x4E0A;&#x56FE;&#x4E2D; <code>return a+b;</code> &#x5904;&#xFF0C;&#x6709;&#x4E24;&#x4E2A;&#x5F00;&#x4F5C;&#x7528;&#x57DF;&#xFF08;&#x58F0;&#x660E; a0 &#x548C; b0 &#x7684;&#xFF09;&#xFF0C;&#x800C;&#x58F0;&#x660E; a1 &#x7684;&#x4F5C;&#x7528;&#x57DF;&#x4E0D;&#x662F;&#x5F00;&#x4F5C;&#x7528;&#x57DF;&#x3002;</p>
</blockquote>
</li>
<li>&#xFF08;&#x5BF9;&#x5E94;&#x4E0A;&#x9762; 2.) &#x6BCF;&#x8FDB;&#x5165;&#x4E00;&#x4E2A;&#x4F5C;&#x7528;&#x57DF;&#xFF0C;&#x5C31;&#x538B;&#x6808;&#x4E00;&#x4E2A;&#x7A7A;&#x5217;&#x8868;&#xFF1B;&#x79BB;&#x5F00;&#x4F5C;&#x7528;&#x57DF;&#x5C31;&#x5F39;&#x6808;</li>
<li>&#x5728;&#x7B26;&#x53F7;&#x8868;&#x4E2D;&#x67E5;&#x627E;&#x53D8;&#x91CF;&#x540D;&#xFF0C;&#x4ECE;&#x6808;&#x9876;&#x5F80;&#x4E0B;&#x67E5;&#x627E;&#xFF08;&#x6240;&#x4EE5;&#x5185;&#x5C42;&#x58F0;&#x660E;&#x624D;&#x80FD;&#x8986;&#x76D6;&#x5916;&#x5C42;&#x58F0;&#x660E;&#xFF09;&#x3002;</li>
</ol>
<p>&#x53E6;&#x5916;&#xFF0C; <strong>&#x53D8;&#x91CF;&#x504F;&#x79FB;&#x91CF;</strong> &#x7684;&#x786E;&#x5B9A;&#x65B9;&#x6CD5;&#x4E5F;&#x9700;&#x8981;&#x4FEE;&#x6539;&#x3002;
&#x5982;&#x679C;&#x6211;&#x4EEC;&#x8FD8;&#x5047;&#x8BBE;&#x504F;&#x79FB;&#x91CF;&#x662F; <code>-12-4*frameaddr</code>&#xFF0C;&#x90A3;&#x53D8;&#x91CF;&#x7684; frameaddr &#x5C31;&#x4E0D;&#x5355;&#x7EAF;&#x662F;&#x7B2C;&#x51E0;&#x4E2A;&#x53D8;&#x91CF;&#x4E86;&#x3002;
&#x4E3A;&#x4E86;&#x4FDD;&#x8BC1; step5 &#x4E2D;&#x53D9;&#x8FF0;&#x7684;&#x6808;&#x5E27;&#x6027;&#x8D28;&#xFF0C;&#x5176; frameaddr &#x662F; &#x201C;&#x5728;&#x6B64;&#x53D8;&#x91CF;&#x521A;&#x58F0;&#x660E;&#x4E4B;&#x524D;&#xFF0C;&#x6240;&#x6709;&#x5F00;&#x4F5C;&#x7528;&#x57DF;&#x4E2D;&#x7684;&#x53D8;&#x91CF;&#x603B;&#x6570;&#x201D;&#x3002;
&#x4F8B;&#x5982;&#x4E0A;&#x56FE;&#x4E2D;&#xFF0C;<code>frameaddr(a1) == frameaddr(b0) == frameaddr(a0)+1</code>&#x3002;</p>
<p>&#x6700;&#x540E;&#xFF0C;&#x540D;&#x79F0;&#x89E3;&#x6790; Visitor &#x9700;&#x8981;</p>
<ol>
<li>&#x7EF4;&#x62A4;&#x7B26;&#x53F7;&#x8868;&#xFF0C;&#x8FDB;&#x5165;&#x5757;&#x8BED;&#x53E5;&#xFF08;<code>compound_statement</code>&#xFF09;&#x65F6;&#x538B;&#x6808;&#x3001;&#x79BB;&#x5F00;&#x65F6;&#x5F39;&#x6808;</li>
<li>&#x6BCF;&#x6B21;&#x9047;&#x5230;&#x53D8;&#x91CF;&#x540D;&#xFF08;<code>Identifier</code>&#xFF09;&#x65F6;&#x67E5;&#x627E;&#x7B26;&#x53F7;&#x8868;&#xFF0C;&#x5C06;&#x5176;&#x5173;&#x8054;&#x5230;&#x5177;&#x4F53;&#x7684;&#x53D8;&#x91CF;&#xFF0C;&#x6216;&#x8005;&#x62A5;&#x9519;&#x53D8;&#x91CF;&#x672A;&#x58F0;&#x660E;</li>
<li>&#x6BCF;&#x6B21;&#x9047;&#x5230;&#x58F0;&#x660E;&#xFF08;<code>declaration</code>&#xFF09;&#xFF0C;&#x786E;&#x5B9A; <code>frameaddr</code>&#x3001;&#x5EFA;&#x7ACB;&#x53D8;&#x91CF;&#x5E76;&#x63D2;&#x5165;&#x7B26;&#x53F7;&#x8868;&#xFF0C;&#x6216;&#x8005;&#x62A5;&#x9519;&#x53D8;&#x91CF;&#x91CD;&#x590D;&#x58F0;&#x660E;</li>
</ol>
<h2 id="ir-&#x751F;&#x6210;">IR &#x751F;&#x6210;</h2>
<p>&#x65E0;&#x987B;&#x65B0;&#x589E; IR &#x8BED;&#x53E5;&#x3002;</p>
<p>&#x5757;&#x8BED;&#x53E5;&#x7684; IR &#x7531;&#x5176;&#x4E2D;&#x5B50;&#x8BED;&#x53E5; IR &#x987A;&#x5E8F;&#x62FC;&#x63A5;&#x800C;&#x6210;&#x5373;&#x53EF;&#x3002;</p>
<h2 id="&#x6C47;&#x7F16;&#x751F;&#x6210;">&#x6C47;&#x7F16;&#x751F;&#x6210;</h2>
<p>&#x65E0;&#x987B;&#x4FEE;&#x6539;&#x3002;</p>
<h1 id="&#x4EFB;&#x52A1;">&#x4EFB;&#x52A1;</h1>
<ol>
<li>&#x6539;&#x8FDB;&#x4F60;&#x7684;&#x7F16;&#x8BD1;&#x5668;&#xFF0C;&#x652F;&#x6301;&#x672C;&#x8282;&#x5F15;&#x5165;&#x7684;&#x65B0;&#x7279;&#x6027;&#xFF0C;&#x901A;&#x8FC7;&#x76F8;&#x5173;&#x6D4B;&#x8BD5;&#x3002;</li>
<li>&#x5B9E;&#x9A8C;&#x62A5;&#x544A;&#x4E2D;&#x56DE;&#x7B54;&#x601D;&#x8003;&#x9898;&#x3002;</li>
</ol>
<h1 id="&#x603B;&#x7ED3;">&#x603B;&#x7ED3;</h1>
<p>&#x672C;&#x8282;&#x6700;&#x91CD;&#x8981;&#x7684;&#x5185;&#x5BB9;&#x662F;&#x540D;&#x79F0;&#x89E3;&#x6790;&#x3002;</p>

                                
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